A small CNC like the Piranha or Axiom AutoRoute 1 Hobby could cutout several scales at a time and round over the edges. I do know that getting to that point will take time. If you want to make thousands one day you will probably need a larger CNC . For these handles you won't need a large heavy machine, a hobby class machine should work for you.
For now you might check around and see if there are any local hobby CNC owners willing to cut some for you. Check with local woodworking clubs to see if there are any one interested. Also check with the woodworking stores to see if they have someone that does this type of work on the side. You supply the materials and they cut the handles, you do the cleanup on the parts.
If you still want to make them with a jig I would use a disk sander for the radius and make a jig that indexes the part to the jig. It will take time to design and build the jig but you will be able to make several quickly and repeatably. Then I would also make templates for routing the round over. You might have to stabilize the scales to prevent tear out before you route them. The stabilizing would also help condition the wood and seal the grain so it would not soak up moisture and chemicals, possibly causing the scales to crack. This could also be a selling point about quality of craftsmanship.
Put some of you profits away to purchase a CNC at a later date.
Let us know of your progress into this project and if you have questions don't hesitate to ask. Remember the more opinions we give the more choices you have.
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Last edited by MEBCWD; 05-02-2017 at 02:08 PM.